What is the Java language
Sun's Java language in the United States (Stanford University Network), launched in 1995, high-level programming language. The so-called programming language is the language of the computer, people can use the programming language for computer orders, let the computer finish features people want.
Java language development history
- Java 1.0 version released in 1995
- Java 1.1 version released in 1997
- Java 1.2 version released in 1998
- Java 1.3 version released in 2000
- Java 1.4 version released in 2002
- Java 1.5 version released in 2004
- Java 1.6 version released in 2006
- 2009 Oracle Oracle's acquisition of Sun Microsystems, and Java 1.7 version released in 2011
- Java 1.8 version released in 2014
- Java 9.0 version released in 2017
What do Java language
Java language mainly used in the field of Internet development program. Common Internet programs such as Lynx, Jingdong, logistics systems, online banking systems, as well as background processing server to store large data query, data mining, there are many applications.
Computer Basics
Binary computer data differs from the data of life of people, people living in decimal number, and the computer used in all binary number, comprising only two numbers 0,1, every binary one, 1 + 1 = 10.
A 1 or a 0 per each called a 'bit (bits).
Interchangeable between different band.
byte
Byte is our common minimum computer storage unit.
Computer store any data bytes are stored in the form, right-click the file attributes, we can see the byte size of the file. 8 'bit (binary digit) 0000-0000 expressed as 1 byte, 1 byte write or 1 B
- 8 bit = 1 B
- 1024 B =1 KB
- 1024 KB =1 MB
- 1024 MB = 1 GB
- 1024 GB = 1 TB
- 1024 = 1 TB EB
- 1024 EB = 1 ZB
Common DOS command
DOS was an early operating system, it has now been replaced by the Windows system, for our developers now need to get something done in DOS, and therefore need to have some of the necessary commands.
Enter the DOS operating window
- Press Windows + R keyboard, open the operating window, type cmd enter into the operation of the DOS window.
- After opening the DOS command line, you see a path c: \ user it means that we are now operating the disk drive c.
- Common Commands
